debugger: Fix the JavaScript debug terminal scenario (#33924)

There were a couple of things preventing this from working:

- our hack to stop the node REPL from appearing broke in recent versions
of the JS DAP that started passing `--experimental-network-inspection`
by default
- we had lost the ability to create a debug terminal without specifying
a program

This PR fixes those issues. We also fixed environment variables from the
**runInTerminal** request not getting passed to the spawned program.

Release Notes:

- Debugger: Fix RunInTerminal not working for JavaScript debugger.

---------

Co-authored-by: Cole Miller <cole@zed.dev>

crates/project/src/project_tests.rs

@@ -568,7 +568,7 @@ async fn test_fallback_to_single_worktree_tasks(cx: &mut gpui::TestAppContext) {
             .into_iter()
             .map(|(source_kind, task)| {
                 let resolved = task.resolved;
-                (source_kind, resolved.command)
+                (source_kind, resolved.command.unwrap())
             })
             .collect::<Vec<_>>(),
         vec![(